Wappalyzer alternatives: what to use for tech detection in 2026

Wappalyzer made technology detection a household tool: install the extension, open a site, see the stack. Two things changed the calculus. The project - open source for over a decade and the fingerprint library half the industry quietly built on - went closed-source, and the hosted product moved to credit-metered pricing that adds up fast for programmatic use. Both are legitimate business decisions; both are why you are reading an alternatives page.

The right alternative depends on which Wappalyzer you were using: the free extension, the fingerprint library inside your own code, or the lookup API. Disclosure: JobsPipe sells a tech-detection API, so we compete in the third category only.

If you used the browser extension

WhatRuns is the drop-in replacement most people land on - free, fast, good coverage of modern frameworks. BuiltWith’s extension is solid and backed by the deepest historical index (its paid side is a different animal - see our BuiltWith alternatives comparison). For one-off manual checks, Netcraft’s free site report adds hosting and certificate detail no extension shows.

If you embedded the open-source library

The community answered the closed-sourcing the way communities do: forks. Maintained fingerprint collections continue the old technologies.json lineage under new names, and language ports (Python and Node wrappers of the fingerprint set) still work for self-hosted detection. The trade-off is maintenance reality: browser vendors and frameworks change constantly, fingerprints rot, and a fork’s coverage is only as good as its contributor base. If detection is core to your product, budget for contributing back; if it is a side feature, an API you do not maintain is usually cheaper than a fork you do.

If you used the API

This is the slice where we have a horse in the race. JobsPipe Stack Scan returns a domain’s detected stack as structured JSON - name, category, confidence, the signals that fired - from a live scan, cached about two weeks. It is self-serve (free tier, then metered per job alongside our jobs API), and it exists for the enrichment use case: score a signup domain, enrich a CRM row, feed an agent. BuiltWith’s API is the other established option, with more history and higher prices. Evaluate all three on the same domains you actually care about - coverage differs by stack type more than vendors like to admit.

The question detection cannot answer

Every scanner in this post reads the public surface of a website. What none of them see is intent: the migration underway, the tools used behind the firewall, the platform a company is hiring its way into. Job postings carry that signal - a company advertising three Kubernetes roles has told you something no homepage fingerprint can. That hiring-based layer of technographics comes from posting data, and combining it with a homepage scan gives both halves: what a company serves today, and what it is building next.